<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #result {
            width: 200px;
            height: 100px;
            margin-top: 10px;
            background-color: #bfd;
        }
    </style>
</head>

<body>

    <!-- 需求: 点击发送get请求, 能获取到服务端中的数据 -->
    <button>点击发送请求</button>
    <div id="result"></div>

    <script>
        const btn = document.getElementsByTagName('button')[0];
        const res = document.getElementById('result');

        btn.onclick = function () {
            const xhr = new XMLHttpRequest();
            // 解决方案 - 加时间戳
            xhr.open('GET', 'http://127.0.0.1:8000/ie-server?t='+Date.now());
            xhr.send();
            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4) {
                    if (xhr.status >= 200 && xhr.status < 300) {
                        res.innerHTML = xhr.response;
                    }
                }

            };

        }
    </script>
</body>

</html>